Synthesis of [1,2,4]Oxadiazolo[4,5-a]thiazolo[2,3-b]pyrimidin-9(10H)-ones via 1,3-Dipolar Cycloaddition of Nitrile Oxide to Thiazolo[3,2-a]pyrimidin-3-one Derivatives
作者:Xiaofang Li、Aiting Zheng、Bin Liu、Xianyong Yu、Pinggui Yi
DOI:10.1002/cjoc.201090181
日期:——
A new class of [1,2,4]oxadiazolo[4,5‐a]thiazolo[2,3‐b]pyrimidin‐9(10H)‐one was prepared in moderate yields by the reaction of nitrileoxide with 2‐arylmethylidene‐6,7‐dihydro‐5H‐thiazolo[3,2‐a]pyrimidin‐3‐one. The reaction site of dipolarphile is the CN of thiazolo[3,2‐a]pyrimidin‐3‐one rather than the expected CC of arylmethylidene. The structures of the products were characterized thoroughly by
通过一氧化二氮与2-的反应制备了中等收率的新型[1,2,4]恶二唑并[4,5- a ]噻唑并[2,3 - b ]嘧啶9(10 H)-一亚苄基-6,7-二氢-5- ħ -噻唑并[3,2-一个]嘧啶-3-酮。偶极亲核试剂的反应位点是噻唑[3,2 - a ]嘧啶-3-酮的CN,而不是芳基亚甲基的预期CC。通过IR,元素分析,MS和NMR分析对产物的结构进行了彻底的表征。
Synthesis of spiro thiazolo[3,2-a]pyrimidine compounds by one-pot sequential 1,3-dipolar cycloadditions
作者:Xiaofang Li、Aiting Zheng、Bin Liu、Guobin Li、Xianyong Yu、Pinggui Yi
DOI:10.1002/jhet.578
日期:2011.7
A new class of spirothiazolo[3,2‐a]pyrimidinecompounds were synthesized by the one‐pot sequential 1,3‐dipolar cycloaddition of azomethine ylide (generated from isatin and sarcosine)–nitrile oxide to 2‐arylmethylidene‐6,7‐dihydro‐5H‐thiazolo[3,2‐a]pyrimidin‐3‐ones in moderate yields. The structures of all the products were characterized thoroughly by NMR, MS, IR, elemental analysis, and NMR together
通过一锅顺序的1,3-偶极环加成甲亚胺(由伊斯丁和肌氨酸生成)-一氧化氮-二氧化氮合成2-芳基亚甲基-6,7,合成了新型螺噻唑[3,2- a ]嘧啶化合物-dihydro-5 H - thiazolo [3,2- a ]嘧啶-3-中等产量。通过NMR,MS,IR,元素分析,NMR和X射线晶体学分析对所有产品的结构进行了全面表征。J.杂环化学。(2011)。